Hi, I've just installed a new Maytag MDB9150 stainless interior dishwasher according to the instructions. The problem- cups come out dirty, with fine powdered food particles left behind on their inside, esp. the bottom. The "accordian style" drain hose, as supplied was very long, but the instructions specifically said not to cut it to length. Is this actually correct? it's attached to the disposal, with a loop about 5" higher than the attachment point, but at least two feet of extra hose lying around under the sink. Could something else be the problem?? Any help would be appreciated- thanks!